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<a name="g_t_005fgfortran_005fcaf_005fsendget_005fby_005fref-_002d_002d_002d-Sending-data-between-remote-images-using-enhanced-references-on-both-sides"></a>
<h4 class="subsection">7.2.16 <code>_gfortran_caf_sendget_by_ref</code> &mdash; Sending data between remote images using enhanced references on both sides</h4>
<a name="index-Coarray_002c-_005fgfortran_005fcaf_005fsendget_005fby_005fref"></a>

<dl compact="compact">
<dt><em>Description</em>:</dt>
<dd><p>Called to send a scalar, an array section or a whole array from a remote image
identified by the <var>src_image_index</var> to a remote image identified by the
<var>dst_image_index</var>.
</p>
</dd>
<dt><em>Syntax</em>:</dt>
<dd><p><code>void _gfortran_caf_sendget_by_ref (caf_token_t dst_token,
int dst_image_index, caf_reference_t *dst_refs,
caf_token_t src_token, int src_image_index, caf_reference_t *src_refs,
int dst_kind, int src_kind, bool may_require_tmp, int *dst_stat,
int *src_stat, int dst_type, int src_type)</code>
</p>
</dd>
<dt><em>Arguments</em>:</dt>
<dd><table>
<tr><td width="15%"><var>dst_token</var></td><td width="70%">intent(in)  An opaque pointer identifying the
destination coarray.</td></tr>
<tr><td width="15%"><var>dst_image_index</var></td><td width="70%">intent(in)  The ID of the destination remote
image; must be a positive number.</td></tr>
<tr><td width="15%"><var>dst_refs</var></td><td width="70%">intent(in) The references on the remote array to store
the data given by the source.  Guaranteed to have at least one entry.</td></tr>
<tr><td width="15%"><var>src_token</var></td><td width="70%">intent(in)  An opaque pointer identifying the source
coarray.</td></tr>
<tr><td width="15%"><var>src_image_index</var></td><td width="70%">intent(in)  The ID of the source remote image;
must be a positive number.</td></tr>
<tr><td width="15%"><var>src_refs</var></td><td width="70%">intent(in) The references to apply to the remote
structure to get the data.</td></tr>
<tr><td width="15%"><var>dst_kind</var></td><td width="70%">intent(in)  Kind of the destination argument</td></tr>
<tr><td width="15%"><var>src_kind</var></td><td width="70%">intent(in)  Kind of the source argument</td></tr>
<tr><td width="15%"><var>may_require_tmp</var></td><td width="70%">intent(in)  The variable is <code>false</code> when
it is known at compile time that the <var>dest</var> and <var>src</var> either cannot
overlap or overlap (fully or partially) such that walking <var>src</var> and
<var>dest</var> in element wise element order (honoring the stride value) will not
lead to wrong results.  Otherwise, the value is <code>true</code>.</td></tr>
<tr><td width="15%"><var>dst_stat</var></td><td width="70%">intent(out) when non-<code>NULL</code> give the result of
the send-operation, i.e., zero on success and non-zero on error.  When
<code>NULL</code> and an error occurs, then an error message is printed and the
program is terminated.</td></tr>
<tr><td width="15%"><var>src_stat</var></td><td width="70%">intent(out) When non-<code>NULL</code> give the result of
the get-operation, i.e., zero on success and non-zero on error.  When
<code>NULL</code> and an error occurs, then an error message is printed and the
program is terminated.</td></tr>
<tr><td width="15%"><var>dst_type</var></td><td width="70%">intent(in)  Give the type of the destination.  When
the destination is not an array, than the precise type, e.g. of a component in
a derived type, is not known, but provided here.</td></tr>
<tr><td width="15%"><var>src_type</var></td><td width="70%">intent(in)  Give the type of the source.  When the
source is not an array, than the precise type, e.g. of a component in a
derived type, is not known, but provided here.</td></tr>
</table>

</dd>
<dt><em>NOTES</em></dt>
<dd><p>It is permitted to have the same image index for both <var>src_image_index</var> and
<var>dst_image_index</var>; the memory of the send-to and the send-from might
(partially) overlap in that case.  The implementation has to take care that it
handles this case, e.g. using <code>memmove</code> which handles (partially)
overlapping memory.  If <var>may_require_tmp</var> is true, the library
might additionally create a temporary variable, unless additional checks show
that this is not required (e.g. because walking backward is possible or because
both arrays are contiguous and <code>memmove</code> takes care of overlap issues).
</p>
<p>Note that the assignment of a scalar to an array is permitted.  In addition,
the library has to handle numeric-type conversion and for strings, padding and
different character kinds.
</p>
<p>Because of the more complicated references possible some operations may be
unsupported by certain libraries.  The library is expected to issue a precise
error message why the operation is not permitted.
</p></dd>
</dl>


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